Locking plug



- A ril 29 1924. 1,492,414

w. .C. BARDENHEUER LOCKING PLUG Filed May 25. 1921 INVENTOR T: H T/Wlliam CEord enheuer moneys Patented Apr. 29, 1924.

; mam PATENT OFFICE.

WILLIAM C. BARDENHEUER, OF BROOKLYN, NEVJ YORK, ASSIGNQR TO BOORU'M 62 PEASE CO'MPANY, OF NEW YORK, N. Y., is CORPQRATION'OF NEW YORK.

LOCKING PLUG.

Application filed May 25, 1921. Serial No. 472,442.

To all whom it may concern:

Be it known that I VVILLIAM O. BARDEN- HEUER, a citizen of the United States of America, residing at 696 East 19th Street,

borough of Brooklyn city and State of New York, have invented certain new and useful Improvements in Looking Plugs of which the following is a specification.

My invention relates to a removable locking plug and particularly to a plug for closing holes for keys and the like. My device is more especially adapted to prevent unauthorized access to mechanism through a hole used for the insertion of control For the purposes ofillustration I have shown my 1I1V8I1l31011'l11 the keys, levers, etc.

accompanying drawings as applied to the opening in the frame of a loose-leaf binder through which a key is inserted to operate the screw mechanism of the binder.

' Fig. 1 is a broken plan of one end of a loose-leaf binder showing my plug in posi-l p mg position shown in F1g. 4. It is impostion for attachment to the binder;

Fig. 2 is a similar view showing my plug locked in the hole, the broken section being taken on line 22 Fig. 4;

Figs. 8 and a are end views of the binder showing the plug in the hole, unlocked and locked respectively;

Fig. 5 is a section of the plug drawn to a larger scale, showing the web of the key I I The lugs 3 engage the notches 4t and preas it appears when the plug is unlocked;

Fig. 6 is a section of the line 2-2 of Fig. 4.

It is frequently desirable to plug an opening in a cover or wall against unauthorized access to what lies behind the cover or beyond the wall. My device is especially fitted to fill this need. It consists of a plug having two parts, a cover 1 and a retaining member 6, in combination with a special key fitting the plug.

Describing the device more in detail, the

diameter of the cover 1 is greater than the diameter of the hole 5 so that the edge 2 of the cover completely covers the opening when the plug is in the hole. On the under face of the edge 2 are one or more lugs 3 which can be fitted into the notches 4 in the margin of the hole 5.

The retaining member 6 is journalled in the cover by a flange 7 turning in a groove 8 in the cover. Thus rotation is the only relative movement which the two parts can have. The body 9 of the retaining member plug taken on g is the same diameter as the hole 5 and has j notched that when its'web is in keyway 12,

the keyway 11 of the cover is empty except in the central circular opening, and the key can turn the retaining member without disturbingthe" cover.

In Fig. 1 I have shown other and opposite the notches 4. in the hole. I make the relation of the keyways and lugs such that when the, lugs are in register the keyways'are out-of register as shown in Flg.

3. With this arrangement the web of thekey holds the key in the plug as shown in Fig. 5 until the parts arerotated to the locksible to lose the plug or key when out of the hole because'they cannot be separated until the two parts of the plug are so rotated to locking position. The key and plug can be vent rotation of the cap. By turning the key the web-in the keyway 12 rotates the retaining member 6, bringing the keyways into register and the lugs out of register, as shown in Fig. 4:. The key can now be removed. The lugs 10 have been rotated from insertion position and underlap the margin of the hole, as shown in Figs. 2 and 6. The cover and retaining member are thus each interlocked withthe plate or body containing the hole.

It will be apparent, since the plug cannot be removed until the two parts are rotated in relation, to each other, and the cover cannotbe rotated at all, that the plug cannot be taken out except by the use of my special key.

What I claim is 1. A removable plug adapted to interlock with a body having a hole therein, comprising a retaining member adapted to underlap the hole and a cover adapted to conceal the retaining member and overlap the hole,

the plug ready for insertion in the hole 5. The lugs 3 and 10 have beenbrought into register with each to prevent rotation with relation thereto, said members being; rotatably attached to:

in combination with a key adapted gether and rotate said to pass through said cover retaining member.

'3. A removable plug having two members adapted to interlock with a plate havinga hole therein, comprising a cover adapted to conceal the othermember of the plug and overlap the hole; and means on said cover adapted to prevent rotation of said cover with relation ,to said hole, in combination with a retaining member constituting the other member, saidmembers being attached together but rotatable with relation to each other, lugs on said retaining, member adapted to underlap; the edge of the hole when rotate'd out of inserting position; and a key 7 adapted to pass through said cover-and rotate said retaining member.

4. A removable plug havingtwo' members adapted tointerloek with a plate having a hole therein, comprising a cover adapted to conceal the other member of the plug and having a keyway therein, and means on said cover adapted to prevent its rotation with relation to thehole, in combination with a retaining member constituting the other member and having a keyvvay therein and adapted to underlap, the edge of the hole except when ininserting position, said 1nembers being'attached together and confined in relative movement to rotation; and a" key adapted to rotate said retaining member, the keyways in said cover" and retaining member permitting insertion and withdrawal of the key only when said retaining member underlaps the edge of the hole.

5; A removable plug having two members adapted to interlock with a plate having a notched hole therein, comprising a cover adapted to conceal the other member of the plug andhaving a keyway therein, a retaining member constituting the other member and having a keyway therein, said members being attached together and freely rotatable with relation to each other, lugs in said cover adapted to fit the notches in the hole and prevent rotation of said cover, and lugs on said retainingmember adapted to pass through said notches when in register with the cover lugs and to underlap the edge of the hole when out of register therewith, in combination with a key to turn said retaining member. 7

6. VA removable plug having two members adapted to interlock with a plate having a notched hole therein, comprising a cover adapted to conceal the other member of the plug and having a keyway therein, a retaining member constituting the other member and having a keyway therein, said members being attached together and freely rotatable with relation to each other, lugs in said cover adapted to fit the notches in the hole and prevent rotation of said cover, and lugs on saidretaining member adapted to pass through said notches when in register with the cover lugs and to underlap the edge of the hole when out of register therewith, in combination with a key to turn saidretaining member; the keyways in said cover and retaining member being positioned to permit Withdrawal of said key only when said lugs are out of register with each other; I V J In testimony whereof I have signed my name to this specification.

WM. 0. rinnnnnri'nnna. 

